| — | Untitled Lani Pixels Project | Grandpa (voice) |
| 2025 | Nobody 2 | David Mansell |
| — | Meteor | Prof. Daniel Lehman |
| — | Amazing Stories: The Movie I | Professor (archive footage) |
| — | The Movers | |
| 2024 | Knuckles | Chief Pachacamac (voice) |
| 2024 | Self Reliance - Allein sein verboten | Dennis Walcott |
| 2024 | Man and Witch: The Dance of a Thousand Steps | The Alchemist |
| 2024 | Guns & Moses | Sol Fassbinder |
| 2023 | STILL: A Michael J. Fox Movie | Dr. Emmet L. Brown (archive footage) (uncredited) |
| 2023 | Nandor Fodor and the Talking Mongoose | Dr. Harry Price |
| 2023 | Camp Hideout | Falco |
| 2022 | Spooky Night - Nachts im Horrorladen | Alex Windsor |
| 2022 | Tankhouse | Buford |
| 2022 | Who Done It: The Clue Documentary | Self (archive footage) |
| 2021 | Nobody | David Mansell |
| 2021 | The Tender Bar | Grandpa Maguire |
| 2021 | Expedition: Zurück in die Zukunft | Self |
| 2021 | Nächster Halt: Weihnachten | Ticket Agent/Conductor |
| 2021 | Queen Bees - Im Herzen jung | Arthur Lane |
| 2021 | Senior Moment | Sal Spinelli |
| 2021 | Inside Star Trek - Hinter den Kulissen des Enterprise-Universums | Self |
| 2021 | King Lear | King Lear |
| 2020 | Reunited Apart | Self |
| 2020 | Stars in the House | Self |
| 2019 | The Mandalorian | Commissioner Helgait |
| 2019 | Jack Nicholson - Einer flog über Hollywood | Self |
| 2019 | The Haunted Swordsman | The Black Monk |
| 2019 | That Guy... Who Was In That Thing 3: Trek Stars | Self |
| 2018 | Mr. Griffin - Kein Bock auf Schule | Melvin |
| 2018 | A Million Little Things | Christopher Lloyd |
| 2018 | Die Conners | Lou Vitore |
| 2018 | Boundaries | Stanley |
| 2018 | James Cameron's Story of Science Fiction | Self |
| 2018 | Making a Killing | Lloyd Mickey |
| 2018 | ReRUN | George Benson (old) |
| 2017 | Abgang mit Stil | Milton Kupchak |
| 2017 | Muse - Worte können tödlich sein | Bernard Rauschen |
| 2017 | The Sound | Clinton Jones |
| 2016 | I Am Not A Serial Killer | Mr. Crowley |
| 2016 | For the Love of Spock | Commander Kruge (archive footage) |
| 2016 | Donald Trump's The Art of the Deal: The Movie | Doc Brown |
| 2016 | Cold Moon | James Redfield |
| 2016 | 50 Years of Star Trek | Self |
| 2016 | Must See TV: An All Star Tribute to James Burrows | Self |
| 2015 | 12 Monkeys | The Missionary |
| 2015 | 12 Monkeys | The Missionary (uncredited) |
| 2015 | 12 Monkeys | Zalmon Shaw / The Missionary |
| 2015 | Back in Time | Self |
| 2015 | Ein Heiratsantrag zu Weihnachten | Grandpa Bob |
| 2015 | 88 | Cyrus |
| 2015 | Back To The Present – Die Zukunft ist jetzt! | |
| 2015 | Doc Brown Saves the World | Emmett Brown |
| 2015 | The Boat Builder | Abner |
| 2015 | Keith Lemon's Back t'Future Tribute | Self |
| 2014 | A Million Ways to Die in the West | Doc Brown |
| 2014 | Sin City 2: A Dame To Kill For | Kroenig |
| 2014 | Hinter der Gartenmauer | The Woodsman (voice) |
| 2014 | Zodiac - Die Zeichen der Apokalypse | Harry Setag |
| 2014 | Blood Lake - Killerfische greifen an | Mayor Akerman |
| 2014 | Die Scifi-Story | Himself |
| 2014 | Pirate's Code: The Adventures of Mickey Matson | Grandpa Jack |
| 2014 | The One I Wrote for You | Pop |
| 2014 | Buenas noches | Self |
| 2013 | The Michael J. Fox Show | Principal McTavish |
| 2013 | Sid the Science Kid: The Movie | Dr. Bonabodon (voice) |
| 2012 | Piranha 2 | Mr. Goodman |
| 2012 | Foodfight! | Mr. Clipboard (voice) |
| 2012 | Dead Before Dawn | Horus Galloway |
| 2012 | Mickey Matson und der geheime Orden | Grandpa Jack |
| 2012 | The Oogieloves in The Big Balloon Adventure | Lero Sombrero |
| 2012 | Freedom Force | Professor (voice) |
| 2012 | Die Hexen von Oz | The Wizard Of Oz |
| 2012 | Excuse Me for Living | Lars |
| 2012 | Last Call | Pete |
| 2012 | Anything but Christmas | Harry |
| 2012 | The Narrative of Victor Karloch | Victor Karloch |
| 2012 | Cadaver | Cadaver |
| 2012 | Say It Ain't Solo | Himself |
| 2011 | Love, Wedding, Marriage - Ein Plan zum Verlieben | Dr. George |
| 2011 | The Chateau Meroux | Nathan |
| 2011 | Die Hexen von Oz | The Wizard of Oz |
| 2011 | InSight | Shep |
| 2011 | Il était une fois… Vol au dessus d'un nid de coucou | |
| 2011 | Adventures of Serial Buddies | Dr. Von Gearheart |
| 2010 | Piranha 3D | Mr. Goodman |
| 2010 | R. L. Stine's The Haunting Hour | Grandpa Walt Montgomery |
| 2010 | Billy und die Schneemänner | The Caretaker |
| 2010 | Tales from the Future | Self |
| 2009 | Santa Buddies - Auf der Suche nach Santa Pfote | Stan Cruge |
| 2009 | Jack im Reich der Riesen | Headmaster |
| 2009 | Meteoriten - Apokalypse aus dem All | Prof. Daniel Lehman |
| 2009 | Ruf der Wildnis | 'Grandpa' Bill Hale |
| 2009 | Die Ritter von Mirabilis | Tesselink |
| 2009 | Live from Studio Five | Self |
| 2009 | Looking Back to the Future | Self |
| 2009 | The Macabre World of Lavender Williams | Lester (voice) |
| 2008 | Fringe - Grenzfälle des FBI | Roscoe Joyce |
| 2008 | Despereaux - Der kleine Mäuseheld | Hovis (voice) |
| 2008 | Fly Me to the Moon | Amos (voice) |
| 2008 | Camelot: Live from Lincoln Center | King Pellinore |
| 2007 | The Big Bang Theory | Theodore |
| 2007 | Chuck | Dr. Leo Dreyfus |
| 2007 | Flakes | Willie |
| 2007 | Head Case | Self |
| 2007 | The Alan Titchmarsh Show | Self |
| 2006 | Psych | Martin Kahn |
| 2006 | Valerie on the Stairs | Everett Neely |
| 2006 | Ein vollkommener Tag | Michael |
| 2006 | Looking Back at the Future | Himself |
| 2005 | Numb3rs - Die Logik des Verbrechens | |
| 2005 | Masters of Horror | |
| 2005 | Zickenterror an der High School | Mr. Chauncey |
| 2005 | Stacked | Harold March |
| 2005 | Arthur Hailey's Detective | Anderson in Launderette |
| 2005 | Here Comes Peter Cottontail: The Movie | Seymour S. Sassafras (voice) |
| 2005 | VM Show Vol. 2 | Dr. Emmett Brown (archive footage) (uncredited) |
| 2004 | The Tony Danza Show | Self |
| 2004 | Admissions | Steward Worthy |
| 2004 | Car Crash: The Delorean Story | Himself |
| 2004 | I Dream | Professor Toone |
| 2004 | Clubhouse | Lou Russo |
| 2003 | Navy CIS | Joseph Smith |
| 2003 | Tremors - Im Land der Raketen-Würmer | Dr. Cletus Poffenberger |
| 2003 | Merry Christmas Space Case | Narrator (voice) |
| 2003 | The Haunted Lighthouse | Cap'n Jack |
| 2002 | Interstate 60 | Ray |
| 2002 | Hey Arnold! – Der Film | Coroner (voice) |
| 2002 | Cyberchase | Hacker (voice) |
| 2002 | Ich wünschte, Du wärst tot | Bruce |
| 2002 | The Big Time | Doc Powers |
| 2001 | Criminal Intent - Verbrechen im Visier | Carmine |
| 2001 | Wit | Dr. Harvey Kelekian |
| 2001 | Keine Angst vor Halloween | Uncle Fred Walker |
| 2001 | On The Edge | Attorney Bum (segment "Happy Birthday") |
| 2001 | Kids World | Leo |
| 2001 | Crazy Love - Hoffnungslos verliebt | Jet James |
| 2001 | Space Case | Narrator (voice) |
| 2000 | Malcolm mittendrin | Walter |
| 2000 | Ed – Der Bowling-Anwalt | Burt Kiffle |
| 2000 | Convergence | Morley Allen |
| 1999 | Der Mondmann | Self (uncredited) |
| 1999 | The West Wing | Professor Lawrence Lessig |
| 1999 | Baby Geniuses | Heep |
| 1999 | Alice im Wunderland | White Knight |
| 1999 | Der Onkel vom Mars | Uncle Martin |
| 1999 | It Came From the Sky | Jarvis Moody |
| 1999 | The Emperor's Treasure | Lord Imaru (voice) |
| 1998 | Echt Blond | Ernst |
| 1998 | Die Abenteuer des Tom Sawyer | Judge Thatcher (voice) |
| 1998 | Die Entführung von Häuptling Rothaut | Sam Howard |
| 1997 | Anastasia | Rasputin (voice) |
| 1997 | King of the Hill | Smitty (voice) |
| 1997 | Stephen Kings Quicksilver Highway | Aaron Quicksilver |
| 1997 | Ein Engel spielt falsch | Al |
| 1997 | Eine grauenvolle Familie | Dad |
| 1997 | Changing Habits | Theo Teagarden |
| 1997 | Completely Cuckoo | Himself |
| 1996 | Chaos City | Owen Kingston |
| 1996 | Chaos City | Owen Kingston (archive footage) |
| 1996 | Im Auge des Sturms | Johnny Benjamin |
| 1996 | Cadillac Ranch | Wood Grimes |
| 1995 | Das Leben nach dem Tod in Denver | Pieces |
| 1995 | Rent-A-Kid | Lawrence 'Larry' Kayvey |
| 1995 | Mr. Payback: An Interactive Movie | Ed Jarvis |
| 1995 | Deadly Games | Jordan Kenneth Lloyd |
| 1994 | Der Pagemaster – Richies fantastische Reise | Mr. Dewey |
| 1994 | Angels - Engel gibt es wirklich | Al the Angel |
| 1994 | Ferien total verrückt | Dennis Van Welker |
| 1994 | Radioland Murders - Wahnsinn auf Sendung | Zoltan |
| 1994 | In Search of Dr. Seuss | Mr. Hunch |
| 1994 | The Making of 'The Pagemaster' | Mr. Dewey - Host |
| 1993 | Die Addams Family in verrückter Tradition | Uncle Fester Addams |
| 1993 | Dennis | Switchblade Sam |
| 1993 | 20 Bucks - Geld stinkt nicht oder doch? | Jimmy |
| 1993 | Fallen Angels | Continental Op |
| 1992 | Dead Ahead: The Exxon Valdez Disaster | Frank Iarossi - Exxon |
| 1992 | T-Bone und Weasel | Weasel |
| 1991 | Die Addams Family | Uncle Fester |
| 1991 | Der Ritter aus dem All | Charlie Wilcox |
| 1991 | Zurück in die Zukunft | Emmett Brown |
| 1990 | Zurück in die Zukunft III | Emmett Brown |
| 1990 | DuckTales: Der Film - Jäger der verlorenen Lampe | Merlock (voice) |
| 1990 | Why Me? | Bruno Daley |
| 1990 | The Secrets of the 'Back to the Future' Trilogy | Dr. Emmett Brown (archive footage) |
| 1990 | The Earth Day Special | Dr. Emmett L. Brown |
| 1989 | Zurück in die Zukunft II | Emmett Brown |
| 1989 | Die Simpsons | Reverend Jim Ignatowski (voice) |
| 1989 | Das Traum Team | Henry Sikorsky |
| 1988 | Falsches Spiel mit Roger Rabbit | Judge Doom |
| 1988 | Acht Mann und ein Skandal | Bill Burns |
| 1988 | Track 29 - Ein gefährliches Spiel | Henry Henry |
| 1988 | Roger Rabbit and the Secrets of Toon Town | Self |
| 1987 | Bobo | Reggie Shand / Henry Shand |
| 1987 | Hüter des Drachen | Jim Martin |
| 1986 | Amazing Stories | R. Beanes |
| 1986 | Miracles - Ein ganz unglaubliches Abenteuer | Harry |
| 1985 | Zurück in die Zukunft | Emmett Brown |
| 1985 | Alle Mörder sind schon da | Professor Plum |
| 1985 | Unglaubliche Geschichten | Professor B.O.Beanes |
| 1985 | Street Hawk | Anthony Corrido |
| 1984 | Star Trek III - Auf der Suche nach Mr. Spock | Cmdr. Kruge |
| 1984 | Buckaroo Banzai - Die 8. Dimension | John Bigboote |
| 1984 | Joy of Sex | Coach Hindenberg |
| 1984 | Street Hawk: The Movie | Anthony Corrido |
| 1984 | The Cowboy and the Ballerina | |
| 1983 | Mr. Mom | Larry |
| 1983 | Sein oder Nichtsein | Capt. Schultz |
| 1983 | September Gun | Jack Brian |
| 1982 | Cheers | Phillip Semenko |
| 1982 | National Lampoon's Movie Madness | Samuel Starkman ("Municipalians") |
| 1982 | Money on the Side | Sergeant Stampone |
| 1982 | Pilgrim, Farewell | Paul |
| 1981 | Wenn der Postmann zweimal klingelt | The Salesman |
| 1981 | Die Legende vom Lone Ranger | Maj. Bartholomew 'Butch' Cavendish |
| 1981 | Best of the West | The Calico Kid |
| 1980 | Schizoid | Gilbert |
| 1980 | Hollywood Cops | Arnold's Collector |
| 1980 | Semi-Tough | |
| 1979 | Mord im Zwiebelfeld | Jailhouse Lawyer |
| 1979 | Die Frau in Rot | Frognose |
| 1979 | Butch und Sundance - Die frühen Jahre | Bill Carver |
| 1979 | The Fantastic Seven | Skip Hartman |
| 1978 | Taxi | Reverend Jim Ignatowski |
| 1978 | Taxi | Reverend Jim 'Iggy' Ignatowski |
| 1978 | Der Galgenstrick | Towfield |
| 1978 | The Word | Hans Bogardus |
| 1978 | Lacy and the Mississippi Queen | Jennings |
| 1977 | Ein anderer Mann, eine andere Frau | Jesse James (uncredited) |
| 1977 | Michael der Indianerjunge | |
| 1975 | Einer flog über das Kuckucksnest | Max Taber |
| 1975 | Saturday Night Live | Self - Cameo (uncredited) |
| 1975 | Barney Miller | Arnold Scully |
| 1975 | Barney Miller | Vincent Carew |
| 1956 | Tony Awards | Self - Performer (uncredited) |
